Airport officials say in a tweet Friday night that an airline employee "conducted an unauthorized takeoff without passengers." Witnesses reported seeing the plane being chased by military aircraft near the airport.

In this photo taken March 24, 2015, an Alaska Airlines jet takes off at Seattle-Tacoma International Airport in SeaTac, Washington (AP Photo/Elaine Thompson, File)

Alaska Airlines says there was an “unauthorised take-off” of an airplane and witnesses reported a jet being chased by military planes near Sea-Tac International Airport in Washington state. However, the plane, which was stolen by an airline employee, has crashed in Washington state.

Airport officials say in a tweet Friday night that an airline employee “conducted an unauthorized takeoff without passengers.” Sheriff’s officials say a man who stole an Alaska Airlines plane from an airport in Washington state was “suicidal” and there is no connection to terrorism.

Witnesses reported seeing the plane being chased by military aircraft near the airport.

The Pierce County Sheriff’s Office said on Twitter that preliminary information suggested that a mechanic had stolen the aircraft. The tweet said the crash may have been caused by the mechanic “doing stunts in air or lack of flying skills.”

Some dude stole a plane from #Seatac (Allegedly), did a loop-the-loop, ALMOST crashed into #ChambersBay, then crossed in front of our party, chased by fighter jets and subsequently crashed. Weird times. pic.twitter.com/Ra4LcIhwfU